http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
천장복사냉방 패널의 냉방용량 설계에서 플레넘 부하의 영향
이규남(Rhee Kyu-Nam),임재한(Lim Jae-Han),류성룡(Ryu Seong-Ryong) 한국태양에너지학회 2024 한국태양에너지학회 논문집 Vol.44 No.1
This study investigated the impact of the plenum load on the cooling capacity of ceiling radiant cooling panel (CRCP) systems. A two-dimensional simulation model using Physibel BISCO was developed to represent a small room (3.8 m (L) × 2.9 m (H)) equipped with CRCPs. To analyze the plenum load impact depending on the CRCP type (top insulation, and open- or closed-type installation), three cases were considered: closed-type with top insulation (Case 1), closed-type without top insulation (Case 2), and open-type without top insulation (Case 3). The simulation results showed that the presence of the plenum load increased the plenum air temperature and caused the CRCP to absorb part of the plenum load, consequently leading to the enhanced cooling capacity of the CRCPs. When the plenum load increased to 10%–20% of the room load, the cooling capacity was enhanced by 7.9% ~ 16.8%, compared to the case without a plenum load. This implied that CRCPs could be undersized when they are designed without considering the plenum load. Furthermore, the cooling capacity showed a greater enhancement in the CRCPs without top insulation (Cases 2 and 3) than in those with top insulation (Case 1). Particularly, a higher cooling capacity was obtained with a higher water temperature when applying CRCPs without top insulation. The results suggested that open-type CRCPs without top insulation would be a good cooling solution for a room with a plenum because they are suitable for removing the plenum load even at relatively high water temperatures.
외단열 벽체에서 창호 설치 위치에 따른 단열성능 및 냉난방 에너지 소비량
이규남(Rhee, Kyu-Nam),정근주(Jung, Gun-Joo) 대한건축학회 2017 大韓建築學會論文集 : 構造系 Vol.33 No.12
In this study, the effect of window installation position in the residential building with the external insulation was numerically investigated in terms of insulation performance and heating/cooling energy consumption. For different window positions, 2-D heat transfer simulation was conducted to deduce the linear thermal transmittance, which was inputted to the dynamic energy simulation in order to analyze heating/cooling energy consumption. Simulation results showed that the linear thermal transmittance ranges from 0.05 W/mK to 0.7 W/mK, and is reduced as the window is installed near the external finish line. Indoor surface temperature and TDR analysis showed that the condensation risk is the lowest when the window is installed at the middle of the insulation and wall structure. It was also found that the window installation near the external finish can reduce the annual heating/cooling energy consumption by 12~16%, compared with the window installation near the interior finish. Although the window installation near the external finish can achieve the lowest heating/cooling energy consumption, it might lead to increased condensation risks unless additional insulation is applied. Thus, it can be concluded that the window should be installed near the insulation-wall structure junction, in consideration of the overall performance including energy consumption, condensation prevention and constructability.
저에너지 공동주택의 감소된 난방부하를 고려한 개별 보일러 열원의 개선 방안
이규남(Rhee, Kyu-Nam),정근주(Jung, Gun-Joo) 한국건축친환경설비학회 2020 한국건축친환경설비학회 논문집 Vol.14 No.1
In this study, the improvement methods of conventional heat sources were suggested and evaluated in order to reduce the heating energy of low-energy apartment buildings. To do this, the part load ratio (PLR) was analyzed for the apartment building that was designed in accordance with the energy saving design standard in Korea. The analysis results showed that the PLR of low-energy apartment buildings was very low, which may result in the reduced part-load efficiency of conventional gas boiler and the deteriorated energy-saving performance. To overcome this problem, it was suggested that the part load efficiency under low-PLR conditions should be enhanced by applying modulation boiler or boiler with high turn-down ratio. The improved part load efficiency allowed more energy saving up to 9.6%. It was also proposed that the low-energy apartment buildings should be equipped with condensing boilers, which have relatively high part load efficiency under low-PLR conditions. It was found that the condensing boiler can reduce the heating energy consumption by 27.0%. As for the operation strategy, it was suggested to decrease supply water temperature in order to increase the boiler efficiency while preventing discomfort due to overheating in the highly-insulated apartment buildings. It was found that water temperature of 40℃ can reduce the heating energy consumption by 13.1%.
스플릿 블라인드의 슬랫 조절 방식에 따른 실내 환경 및 에너지 성능 평가
이규남(Rhee, Kyu-Nam),정근주(Jung, Gun-Joo) 한국건축친환경설비학회 2020 한국건축친환경설비학회 논문집 Vol.14 No.5
The performance of Venetian blinds can be improved by adopting split blinds by which the slat angle in the upper and lower part of the blinds can be separately adjusted. In this study, the impact of the split blinds on the lighting/thermal environment and energy consumption was investigated through field measurement, occupant survey and energy simulation. Four different adjustment methods were evaluated: Case 1 (No blind), Case 2 (All slats open), Case 3 (Upper slats open, lower slats closed), and Case 4 (All slats closed). The evaluation result of lighting environment showed that Case 3 is effective in preventing the excessive illuminance level as well as glare in the winter season, while Case 2 or 3 is suitable for the summer season because the high solar altitude reduces the transmitted solar energy, which leads to the reduced glare risks. The evaluation result of thermal environment revealed that acceptable thermal comfort can be achieved by Case 2 or 3 in the winter season, and Cases 2 to 4 in the summer season. Energy simulation results showed that the overall energy consumption (heating, cooling and lighting energy) can be minimized by applying Case 3, by which the energy consumption can be reduced by 6.2% compared to Case 1.
공기순환장치를 이용한 실내 환기성능 및 온열환경 개선에 대한 실험적 연구
이규남(Rhee, Kyu-Nam),정근주(Jung, Gun-Joo) 한국건축친환경설비학회 2018 한국건축친환경설비학회 논문집 Vol.12 No.3
Although natural ventilation is effective in improving indoor air quality in the intermediate season, its effect can be reduced if single-sided ventilation is applied to the room with much depth. In this case, interior zones can suffer from the insufficient ventilation rate, which can result in poor indoor air quality and occupants’ discomfort. This problem may be solved by implementing air circulators, which can diffuse the air in the perimeter zone into the entire space. In this context, the impact of air circulators on the ventilation performance and thermal environment was investigated through field measurement in a lecture room. Air circulators were combined with the mechanical ventilation (energy recovery ventilator) and natural ventilation. Measurement results showed that the air circulator can reduce CO₂ concentration by enhancing air diffusion in the entire space, when it is combined with the natural ventilation. In addition, it was found that the combination of air circulators and natural ventilation is effective in providing thermal comfort by increasing air speed, particularly during the intermediate season when the outdoor temperature is relatively high. It can be concluded that the air circulator can be utilized to supplement the single-sided natural ventilation for the room with much depth.
헬스케어 시설의 환기량과 쾌적기준을 고려한 설비형 칠드빔 시스템의 운전조건에 관한 연구
이규남(Rhee, Kyu-Nam),정근주(Jung, Gun-Joo) 한국건축친환경설비학회 2016 한국건축친환경설비학회 논문집 Vol.10 No.2
A wardroom in healthcare facilities need to be designed to provide appropriate ventilation rate and high levels of thermal comfort in order to achieve healing environment for patients. Therefore, HVAC system need to be carefully selected for improved indoor environment in wardrooms. In addition, the system should be designed so as to reduce energy consumption, because a large amount of energy is consumed to perform various functions of healthcare facilities. In this context, active chilled beam (ACB) system is regarded as suitable for wardrooms because it operates with much less air flow rate thanks to induction effect by primary air, which results in reduced ventilation energy as well as high thermal comfort. Therefore, this study was conducted to evaluate thermal comfort in a wardroom equipped with ACB system through mock-up tests. As the supply air flow rate significantly affects not only ventilation energy but also indoor environment, thermal comfort with different supply air flow rate was evaluated. Based on the results, the operation condition of ACB system was suggested to ensure proper ventilation rate and thermal comfort. The results showed that the minimum outdoor air flow rate, 2ACH, can satisfy not only ventilation rate and thermal comfort criteria in the wardroom.